Jinichi Kawakami is a Kōka-Ryū ninjutsu practitioner.
Kawakami discusses the accuracy of ninja missions and their connection to samurais in "Batman Begins" (2005) featuring Christian Bale and Liam Neeson, "The Last Samurai" (2003) starring Tom Cruise, and "Teenage Mutant Ninja Turtles" (1990). He also comments on the realism of ninja weapons (such as the shuriken and kunai) in "The Boys" S2E5 (2019), "Mortal Kombat" (2021), and "Naruto: Shippuden" S17E476 & E477 (2016). He discusses the realism of ninjutsu training and skills in "Revenge of the Ninja" (1983) and "Ninja Assassin" (2009).
Kawakami is the last heir of the Ban clan of Kōka-Ryū Ninjutsu. He is also the honorary director of the Iga-ryu Ninja Museum and historical ninjutsu researcher and lecturer at Mie University.
You can find more information about the Japan Ninja Council here:
[Japan Ninja Council]
https://ninja-official.com/?lang=en
[NINDO CHANNEL]
https://www.youtube.com/channel/UCSTcD_J0gG9O6f7Ussya2CA
